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Fatigue behavior of acrylic interpenetrating polymer networks. II
Author(s) -
Hur T.,
Manson J. A.,
Hertzberg R. W.,
Sperling L. H.
Publication year - 1990
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1990.070390909
Subject(s) - crazing , materials science , composite material , polyurethane , brittleness , toughness , fracture toughness , cavitation , deformation (meteorology) , polymer , prepolymer , methyl methacrylate , polymerization , physics , mechanics
Energy‐absorbing simultaneous interpenetrating networks (SINs) based in polyether‐type polyurethanes (PUs) and poly(methyl methacrylate) (PMMA) networks were prepared by a prepolymer procedure. The products are translucent and appear to have single and broad glass transitions, suggesting some degree of phase separation. The percent energy absorption determined from dynamic properties and pendulum impact tests, the resistance to fatigue crack growth and fracture toughness ( K 1 c ) all increase with polyurethane content. The fracture behavior changes from brittle to ductile failure with increasing PU. The fatigue fracture surfaces of the SINs show extensive stress whitening associated with cavitation around the polyurethane domains, and localized shear deformation rather than crazing.